Adding vertigotv filter between videotestsrc and autovideosink

[Sebastian Dröge]

On Do, 2013-11-28 at 19:58 +0600, ArifHossain wrote:
> Hi,
> 
> I'm trying to add a vertigotv filter between videotestsrc and autovideosink like follows :
> 
> GstElement *pipeline, *source, *sink, *filter;
>   
>    
>   source = gst_element_factory_make ("videotestsrc", "source");
>   sink = gst_element_factory_make ("autovideosink", "sink");
>   filter = gst_element_factory_make("vertigotv", "filter");
>   
>   pipeline = gst_pipeline_new ("test-pipeline");
>     
>   if (!pipeline || !source || !sink) {
>     g_printerr ("Not all elements could be created.\n");
>     return -1;
>   }
>    
>   /* Build the pipeline */
>   gst_bin_add_many (GST_BIN (pipeline), source, filter, sink, NULL);
>   if (((gst_element_link (source, filter)) && (gst_element_link (filter, sink)))  != TRUE) {
>     g_printerr ("Elements could not be linked.\n");
>     gst_object_unref (pipeline);
>     return -1;
>   }
> 
> But when it stops with following message :
> 
> "Unable to set the pipeline to the playing state"

Problem here is that vertigotv only handles RGB but your sink probably
wants RGB in a different order or some YUV color format. Try adding a
videoconvert element between vertigotv and the video sink
(ffmpegcolorspace in case you still have to use 0.10). 

> Another thing is how should i debug this kind of scenario to find out what actually went wrong?

Check the output on the terminal, the error messages you get on the bus
and if all fails the GStreamer debug output:
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/section-checklist-debug.html

Instead of --gst-debug you can also set the environment variable
GST_DEBUG.

-- 
Sebastian Dröge <sebastian at centricular.com>
Centricular Ltd - http://www.centricular.com
Expertise, Straight from the Source
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